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Pretreatment process for cleaning and bleaching chemical mechanical pulp

A chemical mechanical and pretreatment technology, applied in the direction of chemical/chemical mechanical pulp, pulp bleaching, etc., can solve the problems of high cost, limited application range, poor fiber affinity, etc., to reduce the dosage, solve the problem of easy yellowing and biodegradability Improved effect

Active Publication Date: 2012-07-04
SHANDONG TAIYANGZHIYE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thiol [17] and phosphorus derivatives THPP, P(CH 2 CH 2 CH 2 Oh) 3 It is considered to have dual effects of bleaching and whiteness stabilization at the same time, but these methods are limited in scope of use due to many disadvantages such as high cost and poor affinity with fibers

Method used

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  • Pretreatment process for cleaning and bleaching chemical mechanical pulp
  • Pretreatment process for cleaning and bleaching chemical mechanical pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) A certain amount of solid enzyme preparations: laccase, hemicellulase, and cellulase are used in a certain proportion, and the enzyme activity is 10:20:1, of which the enzyme activity of laccase is 30000IU per ton of pulp, wood poly Carbohydrate enzyme activity is 60000U, cellulase activity is 3000U, add to the material tank;

[0023] (2) Then add clean water to the material tank, the pH value is 6, and add the mediator HBT 2-(2'-hydroxyphenyl)benzotriazole, the dosage is 5‰ of the ton slurry, and non-ionic surfactant TX-10 octylphenol polyoxyethylene ether, the dosage is 2.5‰ per ton of pulp, stir evenly in the material tank, the rotation speed during stirring is 65r / min, and the enzyme solution with a concentration of 20% is prepared;

[0024] (3) After stirring for 3 minutes, input the enzyme liquid into the finished product tank, and store at 50°C;

[0025] (4) Add 2% dilute sulfuric acid, adjust the pH value of the slurry in the upflow tower to 4.0, the temper...

Embodiment 2

[0029] (1) A certain amount of solid enzyme preparations: laccase, hemicellulase, and cellulase are used in a certain ratio, and the enzyme activity is 10:20:2, of which the enzyme activity of laccase is 30000IU per ton of pulp, wood poly Carbohydrate enzyme activity is 60000U, cellulase activity is 6000U, add to the material tank;

[0030] (2) Then add clean water to the material tank, the pH value is 7, and add the mediator HBT 2-(2'-hydroxyphenyl) benzotriazole, the dosage is 4‰ per ton of pulp, and non-ionic surfactant TX-10 octylphenol polyoxyethylene ether, the dosage is according to 3‰ per ton of pulp, stir evenly in the material tank, the rotating speed is 85r / min during stirring, and the enzyme solution with a concentration of 10% is prepared;

[0031] (3) After stirring for 3 minutes, input the enzyme solution into the finished product tank, and store at 45°C;

[0032] (4) Add dilute sulfuric acid to adjust the pH value of the slurry in the upflow tower to 5.0, the ...

Embodiment 3

[0036] (1) A certain amount of solid enzyme preparations: laccase, hemicellulase, and cellulase are used in a certain proportion, and the enzyme activity is 10:20:1, of which the enzyme activity of laccase is 30000IU per ton of pulp, wood poly Carbohydrate enzyme activity is 60000U, cellulase activity is 3000U, add to the material tank;

[0037] (2) Then add clear water to the material tank, the pH value is 6.5, and add the mediator HBT 2-(2'-hydroxyphenyl) benzotriazole, the dosage is 6‰ per ton slurry, and non-ionic surfactant TX-10 (octylphenol polyoxyethylene ether), consumption is according to 2 ‰ of ton slurry, stirs evenly in feed tank, and rotating speed is 90r / min during stirring, and the enzyme liquid that makes concentration is 25%;

[0038] (3) After stirring for 3 minutes, input the enzyme solution into the finished product tank, and store at 35°C;

[0039] (4) Add 2% dilute sulfuric acid to adjust the pH value of the slurry in the upflow tower to 4.5, the temper...

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Abstract

The invention relates to a cleaning and bleaching technology suitable for chemical mechanical pulp, particularly alkaline peroxide mechanical pulp (APMP). The process is mainly characterized in that: the APMP is pretreated by adopting compound biological enzyme before H2O2 bleaching, and diffusion of the enzyme in the pulp and role exertion of a laccase / mediator system are improved by using good compatibility of biological surfactant and enzyme preparation, so that the bleaching efficiency of the chemical mechanical pulp is improved, the final bleaching degree of the produced pulp is improved, the whiteness stability of the pulp is good, and the pulp can meet the requirements of paper products with high additional values. Meanwhile, the wastewater pollution load produced by bleaching the pulp is effectively reduced by biological enzyme pretreatment.

Description

technical field [0001] The invention relates to pulping and papermaking technology, in particular to a method for cleaning and pretreatment of chemical mechanical pulp, especially for the chemical APMP production process of eucalyptus wood. Background technique [0002] At present, my country's pulp and paper industry is also facing the shortage of raw materials and energy shortage. Chemimechanical pulp has become the development trend of the pulp and paper industry due to its advantages of high pulp yield, good strength and low energy consumption. Chemimechanical pulp is more difficult to bleach than chemical pulp due to the pulping method that retains most of the lignin in the raw material. Due to the cost of bleaching agent and bleaching effect, currently only two bleaching agents, hydrogen peroxide and sodium dithionite, are widely used in chemical mechanical pulp bleaching. However, the whiteness stability of pulp after bleaching is poor, and it is easy to turn yellow....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/16D21H11/02
Inventor 刘梦茹乔军应广东钟洪霞
Owner SHANDONG TAIYANGZHIYE
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